LUA File Transfer Locks Out 3270 User Sessions

 Last reviewed: March 17, 1997
Article ID: Q162665

The information in this article applies to:

  • Microsoft SNA Server, versions 2.0, 2.1, 2.11, and 3.0

SYMPTOMS

When invoking a file transfer using the Data Connection NetView/DM Agent (NDMA) on a computer running SNA Server, all 3270 client user requests "hang" until the file transfer has completed. When running a 3270 emulator on the server, a 3270 request does get processed, but the response time is very slow.

CAUSE

The Data Connection NetView/DM Agent uses the LUA RUI API to communicate with the host. Even though the LUA LU being used was defined as a "low priority LU" (that is, the "high priority LU" checkbox on the LUA LU definition within SNA Server Admin is not checked), SNA Server was queuing the LUA application requests in a high-priority internal queue, ahead of 3270 user requests. All user requests made on 3270 LU sessions are always defined as "high priority," though they were not being properly handled as high priority.

RESOLUTION

A fix is available to correct this problem.

STATUS

Microsoft has confirmed this to be a problem in SNA Server versions 2.0, 2.1, 2.11, 2.11 Service Pack 1 (SP1), and 3.0. A supported fix is now available for SNA Server versions 2.11 and 3.0, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.

Additional query words: prodsna 2.00 2.10 2.11 3.00 kbbug2.00 sna3sp1fix
Keywords : sna3270 snalua snaserverservice kbbug2.10 kbbug2.11 kbbug3.00 kbbuglist kbfix2.11.sp2
Version : 2.00 2.10 2.11 3.00

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Last reviewed: March 17, 1997
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